Carburetor



W. E. GOLDI Nov. 11, 1941;

CARBURETOR Filed Aug. 5, 1940 2 Sheets-Sheet 1.

W mvE ri zo R ATTORNEYS Nov. 11, 1941. w. E.

CARBURETQR Filed Aug. 5, 1940 .GOLDI 2,261,992

' 2 Sheets-Sheet 2 I WITNESS gayimvnnora' ATTORNEYS Patented Nov. 11,194 1 UNETED STATES PATENT OFFICE I CARBURETOR William E. Goldi, CulverCity, Calif. Application August 5, 1940, Serial No. 351,503

8 Claims.

This invention relates to a carburetor and has for an object to providea carburetor and connections therefor adapted to provide relief ofharmful depression conditions in the combustion chamber of an internalcombustion motor arising from the absence of a compressible mediumwhenever the motor is propelled by any outside force, such as themomentum of a vehicle descending a grade or preliminary to stopping withthe carburetor throttle valve completely closed.

Carburetion creates an unnecessary waste of gasoline due to the idlingposition of the throttle valve, and also a suction is created by thepiston rings whereby crank case oil is drawn into the combustion chamberdue to the void in the combustion chamber. Upon resuming power theunnecessary oil is burned and creates carbon and unnecessary fouling ofthe plugs, chambers, pistons and rings and also throws an unnecessarystrain upon the lower or connecting rod, bearing caps, etc. Todistinguish between the two actions which are produced by the carburetorof this invention, it may be said that carburetion takes place when thethrottle valve is operating normally as a mixture metering valve whenthe, motor is propelling the vehicle, and no carburetion takes place,according to this invention, when the throttle valve is fully open andoperating in conjunction with a fuel shut-off valve when the vehicle ispropelling the motor.

Briefly, the present invention contemplates disconnecting the throttlevalve from the direct control of the accelerator pedal and permitting itto be electrically controlled to open and close independently of theoperation of the accelerator pedal in conjunction with an electricallycontrolled plunger valve which completely shuts off the fuel supplysimultaneously with this independent movement of the throttle valve tofully open position. The advantage of this construction and operation isthat of utilizing the idle or closed periods of the conventionalcarburetor throttle while the vehicle is propelling the motor, since thefully open throttle functions merely as an air inlet valve for supplyinga compressible medium for the piston to relieve the above describeddetriment, and the fully closed fuel valve functions to promote fueleconomy.

A further object is to provide apparatus of this character which will beformed of a few strong, simple and durable parts, which will beinexpensive to manufacture, and which will not easily get out of order.

With the above and other objects in View the invention consists ofcertain novel details of construction and combinations of partshereinafter fully described and claimed, it being understood thatvarious modifications may be resorted to within the scope of theappended claims without departing from the spirit or sacrificing any ofthe advantages of the invention.

In the accompanying drawings forming part of this specification:

Figure 1 is an end elevation of a conventional internal combustionengine and a carburetor constructed in accordance with the invention.

Figure 2 is a vertical sectional view taken on the line 22 of Figure 1drawn to large scale showing the parts of the carburetor in normalidling position.

Figure 3 is a vertical sectional view taken on the line 3-3 of Figure 2.

Figure 8 is a diagrammatic view showingthe electrical connections of thecarburetor.

Referring now to the drawings in which like characters of referencedesignate similar parts in the various views, I 0 designates acarburetor for an internal combustion motor II, the carburetor as usualbeing connected at the bottom to the intake manifold l2 and at the topto the air intake pipe l3, which in the present embodiment of theinvention is equipped with a conventional air cleaner I l. Thecarburetor is provided with a fuel chamber Hi, the fuel level of whichis controlled by a conventional valve l6 which controls a fuel inletpipe I! and is provided with a float 9 which maintains the required fuellevel in the chamber. The chamber communicates through alined fuelpassages l8 and I9 with vent passages 20' which communicate with themixing chamber in the usual manner. A throttlevalve -2| is secured byscrews 22, or other connectors, to a shaft 23 which projects at bothends from the carburetor. These parts are substantially conventional inall carburetors.

In carrying out the invention a throttle lever 24 is loosely mounted atone end on a hub 25 formed on the carburetor and which forms a bearingfor one end of the throttleshaft 23.

The throttle lever is connected at the free end to an accelerator rod 26which is as usual connected to an accelerator pedal not shown. The

throttle lever is limited in movement toward closed throttle position byan adjusting screw 21 carried by a bracket arm 26 which projects fromthe carburetor.

The throttle lever is provided on the upper side intermediate its endswith a curved arm 29 whose center of curvature is on the axis of thethrottle shaft 23 and which is provided with a curved longitudinal slot36. A crank 3|is secured at one end to the projecting end of thethrottle shaft 23 by a set screw 32 and at the opposite end is providedwith a roller 33 which rides in the slot 30.

A helical spring 34 is sleeved on the projecting end of the throttleshaft 23 and one end is engaged in an opening 35 in the crank 3| and theopposite end is engaged in an opening 36 formed in a collar 31 which isadjustably secured on the hub 25 by a set screw 38. The spring normallytends to hold the crank 3| in such position that the roller 33 isdisposed on a seat 39 formed at the lower end of the slot 30 in whichposition the throttle valve 2| is fully closed, or is in adjustedposition according to the adjustment of the screw 21. When theaccelerator rod 26 is moved upwardly to full open position, the seat 39of the throttle lever will push the roller 33 ahead of it and rock thecrank to open the throttle valve.

For moving the throttle valve 2| independently of the throttle lever 3|a solenoid 46 is secured to the carburetor, as shown in Figures 2, 3, 4,and 6, by a band clamp 4|, or other means. The core 42 of the solenoidis provided with a Z- shaped link 43 which is received in an arcuateslot 44 formed in an arcuate arm 45 which is integral with a lever 46secured to the opposite end of the throttle shaft 23 from the throttlelever by means of a set screw 41.

When the solenoid is energized, the core 42 will swing the lever 46downward to rock the throttle valve 2| fully open, the crank 3| androller 33 moving longitudinally of the throttle levers curved arm 36during this operation. An adjusting screw 48 is disposed in the bottomof the solenoid 46 to limit downward movement of the core 42. A helicalspring 49 is sleeved on the core 42 to return the core to initialposition after each actuation, the core during such movement pushing thelink 43 upwardly in the slot 44 to allow the throttle valve to be underthe control of the accelerator rod 26.

When the parts are in the position shown in Figure 4, the vehicle isbeing propelled by the ground wheels, as when traveling downgrade whileat the same time the solenoid is energized to move the throttle valve tofully open position to supply uncarburated air, to the combustionchambers of the cylinders to provide a compressible medium and preventobjectionable void in the cylinders.

By referring to Figure 2 it will be seen that a fuel controlling plungervalve 59 is slidably mounted in a valve housing 5|, formed integral withthe carburetor, and is provided with a transverse passage 52 whichregisters completely or partly with the passages I6 and I9 to controlthe flow of fuel to the jetpassages 20. A compression spring 53 ismounted in the housing below the plunger valve and tends to normallyopen the valve. To prevent the valve from turning axially a projection54 is formed on the wall of the housing and enters a longitudinal groove55 formed in the side of the valve.

The valve is equipped with a stem 56 which projects through anadjustable collar 51 carried by the top of the housing. The stem isequipped with an adjusting screw 58 whichcontacts with a cam surface 59formed on the bottom of one end of a rocker arm 60 which is pivotedintermediate its ends, on a pivot pin 6|, on a bracket 62 which risesfrom the top plate 63 of the carburetor. A spring 64 fixed to the pivotpin 6| engages the rocker arm 66 and tends to hold the rocker armagainst the screw 58 and prevent rattle, see Figure 4.

A linkage connects the solenoid core 42 with the rocker arm andcomprises a lever 65 which arm 14 on the carburetor.

is secured rigidly to the top of the core and is connected to a link 66which is connected to a reduction lever 61 which is pivoted, as shown at68, to the side of the carburetor. A link 69 is connected to the lever61 and at the upper end is provided with a longitudinal slot 10 whichreceives a pin 1| fixed to the rocker arm 60.

When the throttle lever 24 is in idling position, as will be the casewhen the vehicle coasts downhill, with the generator running atgenerating speed, the uncarburated air supplying function of thecarburetor takes place as previously explained, simultaneously therewiththe core lever '65 will be at its downward limit of movement to pull thefree end of the rocker arm downward with the result that the rocker armcam portion pushes the fuel plunger valve 56 down to its extreme lowerlimit of movement to disconnect the passage 52 in the valve from thepassages I8 and I9 and positively shut off the flow of fuel through thevalve to the jets 20, thus saving fuel which normally is wasted inconventional carburetors.

When the valve 50 is thus operating during uncarburated air valvefunction of the carburetor to shut off the fuel supply, the solenoid 40is automatically energized by the generator by the closing of switchmeans in the solenoid circuit. The switch means comprises a switchcontact 12 on the throttle lever as shown in Figures 5 and 6 and astationary switch contact 13 on an When the throttle lever 24 is inidling position and the vehicle is coasting down hill the switch contact12 will be disposed in circuit closing position with the stationaryswitch contact 13 and close the energizing circuit of the solenoid 40.

The electrical control for the solenoid 40 will now be described. Asshown in Figure 7, the generator cut-out 15 comprises an electro-magnet16 having an armature 11 carried by a pivoted arm 18 formed ofinsulating material. A pair of stationary contacts 19 and is fixed to aninsulating arm 8| which projects from the electro-magnet, and whichunderlie a bridging contact 82 disposed on the bottom face of thearmature arm 18. The electro-magnet is grounded in the usual manner asshown. The contact 19 is connected to the solenoid 40 by a wire 83. Thecontact 86 is connected to the generator by a wire 84. The bridgingcontact 82 is connected by a spring conductor arm 85 and wire 1 to thebattery. The solenoid 46' is connected to the stationary contact 13 onthe carburetor by a wire 6.

' Under normal running conditions when the carburetor is operating as afuel metering device and the throttle lever 24 is in some degree of openposition, the generator is charging the battery through the wire 84,contacts 80 and 82, spring conductor 85 and wire 1. I

Whenever the heretofore mentioned switch contacts 12 and 13 are broughtinto circuit closing position by movement of the throttle lever 24, thesolenoid 40 will be automatically energized to open the throttle valve2| fully if the generator contacts 19 and 82 are in circuit closingposition. Energizing of the solenoid 40 occurs only when the generatoris charging the battery and the throttle lever 24 is in idling position,which isonly when the motor is operating above idling speed, as when thevehicle is propelling the motor when the vehicle is coasting down hillor when the vehicle is slowing down to come to a stop.

When the motor drops down to idling speed and the carburetor isfunctioning as a mixture 7 metering device the generator no longercharges the battery so that the electro-magnet 40 is deenergized, thecontacts 19, BB and 82 are in open circuit position, and all theuncarburated air valve parts are quiescent to cause the carburetor tooperate as a normal carburetor.

It is contemplated in the present invention to economize in fuel undernormal running or metering conditions of the carburetor. To effect thisa pipe 86 is connected to the intake manifold l2 at one end and at theopposite end enters the top of a cylinder 81 which is mounted on thebefore-mentioned bracket arm 62. A piston 88 is disposed in the bottomof the cylinder and carries a cable 89 which passes through an opening91] in the bottom of the cylinder and is connected to the rocker arm 60.A helical spring 90 is seated on top of the piston and the pressure ofthe spring is regulated by an adjusting screw 9|.

During normal driving conditions when the operator slacks his footpresure on the accelerating pedal, a vacuum will build up in the intakemanifold and be communicated to the piston 88 to lift the piston andpull up the adjacent end of the rocker arm thereby pushing down the camportion 59 of the rocker arm against the screw 58 carried by the fuelvalve 50 to partly close the fuel valve and eifect an appreciable savingof fuel over normal carburetors.

From the above description it is thought that the construction andoperation of the invention will be fully understood without furtherexplanation.

What is claimed is:

l. The combination with an internal combustion engine and a generator,of a carburetor, a throttl valve in the carburetor, a throttle leverreleasably connected to the throttle valve, electro-magnetic meansreleasably connected to the throttle valve and responsive topredetermined speed of the generator and to position of the throttlelever for opening the throttle valve independently of the throttlelever, a fuel valve in the carburetor, and means connected to thethrottle valve and responsive to actuation of said electro-magneticmeans for closing the fuel valve.

2. The combination with an internal combustion engine and a generator,of a carburetor, a throttle valve in the carburetor, a throttle leverreleasably connected to the throttle valve, electro-magnetic meansreleasably connected to the throttle valve, a circuit for said meansconnected to the generator, switch means in the circuit controlled bythe throttle lever and by pre-determined generator speed to energize thelectromagnetic means for opening the throttle valve noid havingaspring-pressed core releasably connected to the throttle valve, acircuit and switch means therein connected to the solenoid and tothegenerator and controlled by the throttle lever and by batterycharging speed of the generator for energizing .the solenoid to actuatethe core and open the throttle valve when the throttle lever is inidling position and the engine is operating above idling speed, a fuelvalve in the carburetor, and means: connected to said core and connectedto the fuel valvefor closing the fuel valve when the solenoid isenergized.

4. The combination with an internal combustionengine and a generator, ofa carburetor, a throttle valve in the carburetor, a throttle leverconnected to the throttle valve, a solenoid having aspring-pressed coreconnected to the throttle valve, means disconnecting the throttle leverfrom the throttle valve and connecting the throttle valve to the corewhen the solenoid is energized, a circuit for the solenoid connected tothe generator, switches in the circuit controlled by the throttle leverand by pre-determined speed of the generator for energizing the solenoidto actuate the core for opening the throttle valve when the throttlelever is in idling position and the engine is operating above idlingspeed, a fuel valve in thecarburetor, and means connected to thecore andconnected to. the fuel valve. for clos- .ing the fuel valve whenthesolenoid is energized.

-5. The combination with an internal. combus- 1131011 engine and agenerator, of a carburetona throttle valve in the carburetor, a throttlelever, an arm on the throttle lever provided with an arcuate slotconcentric with the axis of the throttle valve, a crank connected to thethrottle lever movable by one end wall of said slot to open the throttlevalve and movable longitudinally of the slot to disconnect the throttlelever from the throttle valve, a solenoid having a spring-pressed core,a second crank connected to the throttle valve, an arm on the secondcrank provided with an arcuate slot concentric with the axis of thethrottle lever, a link connected to the solenoid core and adapted toengage an end wall of the second slot to open the throttle valve whenthe solenoid is energized and movable longitudinally of the second slotby said core to release the throttle valve for operation by the throttlelever when the solenoid is deenergized, a circuit for the solenoid,switch means in the circuit controlled by the throttle lever and bypre-determined speed of the generator to energize the solenoid when thethrottle lever is in from the throttle valve and; connecting. thethrottle valve to be moved by the core-when the solenoid is energized,acircuit for the solenoid connectedto the generator, a switch of whichthe throttle lever is thelmovable'member for closing the circuitat onepoint when the throttle lever is in idling position, an electro-magneticcontrolled switch in said circuit controlled bythe generator to closethe circuit at anothertpoint when thegenerator is running at batterycharging speed and the engine is operating above idling speed, closingof bothswitches simultaneously efiecting the energizing of the solenoid,a' fuel valve in the carburetor, vand means connected to the core andconnected to the fuel valve for closing the fuel valve when thesolenoidis energized.

7. The combination with an internal combustion engine and a generator,of a carburetor, a throttle valve in the carburetor, a throttle leverconnected tothe throttle valve, a solenoid having a spring-pressed. coreconnected to the throttle valve, means disconnecting the throttle. leverfrom the throttle valve and connecting the throttle valve to be moved bythe core when. the solenoidis energized, a circuit for thesolenoidconnected to the generator, a switch of which the throttle leveris the movable member for closing the circuit at one point when thethrottle lever is in idling position, an electro-magnetic controlledswitch in said circuit controlled by the generator to close the circuitat another point when the generator is running at battery charging speedand the engine isvoperating above idling speed, closing of both switchessimultaneously effecting the energizing of the solenoid, a fuel valve inthe carburetor spring-pressed to normal open position, a rocker arm onthe carburetor having a cam surface engaging the fuel valve to close thefuel valve against the tension of the controlling spring thereof, andlinkage connected to said core and to the rocker arm for moving therocker arm to close the fuel valve when the solenoid is energized.

8. The combination with an internal combustionengine and agenerator, ofa carburetor, a throttle valve in the carburetor, a throttle leverconnected to the throttle valve, a solenoid having a spring-pressed coreconnected to the throttle valve, means disconnecting the throttle leverfrom the throttle valve and connecting the throttle valve to be moved bythe core when the solenoid is energized, a circuit for the solenoidconnected to the generator, a switch of which the'throttle lever is themovable member for closing the circuit at one point when the throttlelever is in idling position, an electro-magnetic controlled switch insaid circuit controlled by thegenerator to clos the circuit at anotherpoint when the generator is running atvbattery charging speed and theengine is operating above idling speed, closing of both switchessimultaneously' efiecting the energizing of the solenoid, a fuel valvein the carburetor spring-pressed to normal-open position, a rocker armon the carburetor having a cam surface engaging the fuel valve to closethe fuel valve against the tension of the controlling spring thereof,linkage connected to said core and to the rocker arm for moving therocker arm to close the fuel valve when the solenoid is energized, acylinder connected to the carburetor, a spring-controlled piston inthecarburetor, a flexible connection between the piston and the rockerarm, a suction pipe connected to the carburetor and exerting suction onthe piston against the tension of its controlling spring to move thepiston when the engine operator slacks driving pressure on the throttlelever, and means releasably connecting said linkage to the rocker arm topermit operation of the rocker arm by said piston without aifecting saidlinkage.

' WILLIAM E. GOLDI.

